Difficulty: Easy - for beginners
1/4 cup table salt
1/4 cup baking soda
1/2 cup of white vinegar
Mix salt and soda. Whisk together in a bowl.
Pour the salt/soda mixture down an open drain.
Then pour a 1/2 cup of white vinegar down the drain, the it will foam up.
Wait for a few seconds and then run hot water for a few minutes down the drain, and water should run smoothly.
The drain will be unclogged, naturally!!